Temperature-control locomotive-cylinder



W. V. TURNER.

TEMPERATURE CONTROL LOCOMOTIVE CYLINDER.

APPLICATION FILED MAYI2.19I6.

1,3 1 4:, 1 67 Patented All". 26, 19H).

INVENTOR 1 TED STATES PATENT OFFICE.

WALTER V. TURNER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO THE WESTING- HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

TEMPERATURE-CONTROL LOCOMOTIVE- CYLINDER.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application filed May 12, 1916. Serial No. 96,996.

To all whom it may concern Be it known that I, VVALTER V. TURNER, a

citizen of the United States, residing at steam.

It is well known that with the use of superheated steam. the cylinders become highly heated and when the locomotive is drifting with steam shut off, although lubricating oil continues to flow into the cylinders, the absence of steam causes imperfect lubrication, and the high temperature of the cylinder walls tends to cause the carbonization of the lubricating oil'in the presence of air, which is disastrous to the wearing parts.

Various automatic devices have heretofore been proposed for supplying steam in limited quantities to the cylinders when the locomotive is drifting, but it is also desirable to prevent the flow of steam to the cylinders when the locomotive is stationary or when the-locomotive is being used in switching service Where the drifting periods are very short and there is no necessity for supplying steam to'the cylinders, and to accomplish the above result is the principal object of my invention.

In the accompanying drawing, the single figure is a sectional view of a valve device embodying my invention.

According to my invention, a valve device may be provided comprising a casing 1, having piston chambers 2- and 3 containing the respective piston heads 4 and 5 of a differential piston device, the chamber 6 between the piston heads 4 and 5 being connected by a branch pipe 7 to pipe 8 through which steam is supplied to the locomotive steam cylinders when the usual. steam throttle is opened.

Chamber 6 is connected through a restricted port 9 and passages 10 and 11 with the piston chamber 2 and also with a timing reservoir 12.

The difierential piston device is provided with a stem 13 adapted upon movement of the piston device to engage and open a valve 14 for supplying steam from a steam supply pipe 15 through passage 16 to piston chamber 3, the valve being subject on its outer face to the steam pressure in passage 16 supplied thereto through passage 17 and to the pressure of a coil spring 18.

When the piston device opens the valve 14, the small piston head 5 moves to a position for opening a by-pass passage 19 around the piston head, so that the piston chamber 3 is then connected to the chamber 6.

In operation, when steam is supplied to the locomotive steam cylinders by manipulation of the steam throttle, steam also flows through pipe 7 to chamber 6, and since the pressure builds up faster in chamber 6 than in piston chamber 2, due to the restricted port 9 and the timing reservoir 12, the differential piston device will be shifted to the position shown in the drawing.

Steam continues to flow through the restricted port 9 until the timing reservoir 12 and piston chamber 2 are charged to the full steam pressure supplied through pipe 8 and at the same time, the usual slight leaka c which occurs past any piston, permits tie pressure in chamber 6 to equalize past piston 5 into the small chamber 3, so that with the steam pressures equalized on all sides of the differential piston, the same will remain in the position shown in the drawing, while under steam ressure, or at least, if the pressure in cham er 3 should not build up rapidly enough, while the differential piston might possibly move to the right so that the stem 13 will engage the valve 14, further movement will then be arrested, since there will not be sufficient force present to lift the valve from its seat against the resistance of spring 18.

When it is desired to stop the train, and steam is cut off from the locomotive steam cylinders, the steam pressure in chamber 6 will be reduced more rapidly than the pressure in piston chamber2 and reservoir 12 can reduce through the restricted port 9 so that the differential piston device W1 lhe shifted to open the valve 14 and permit steam at low pressure to flow to piston chamber 3 and thence through by-pass 19 and pipe 7 to the locomotive steam cylinders;

Steam will continue to flow from chamber 2 and reservoir 12 through the restricted port 9 to chamber 6 until the steam pressures have equalized, the time required for the restricted port 9 and thereservoir 12' can be arranged so as to permit the'closing of the valve 14 at the end of a predetermined time corresponding with the approximate time required to make the stop.

Where a locomotive equipped with this device is employed in switching service, the

frequency with which stops are made, prevents the full recharging of the time reser aerate? voir 12, so that in such cases, the valve device does not open to admit steam to the cylinders, unless the running period preceding the drifting period has been quite extensive.

It will thus be seen that steam is not admitted to the locomotive cylinders where the locomotive is making frequent stops as in switching service, and also that steam is antomatically cut ofi when the locomotive comes to a stop.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is: V

A drifting device for locomotives, comprising a casing, a differential piston therein aving the space between the piston heads in communication with the locomotive cylinder steam supply pipe, a reservoir connected to the space at the outer face of the larger piston head and communicating with the locomotive steam supply pipe through a restricted port, and a'valve operated by said difierential piston when the steam supply to the locomotive cylinders is out OK for supplyin steam in a limited quantity to the cylin ers.

-' 1 In testimony whereof I have hereunto set my hand,

WALTER V, TURNER, 

